Add response(s) to this multistatus, in order to build a multistatus
as returned for COPY, MOVE, LOCK or DELETE requests resulting in an error
with a resource other than the resource identified in the Request-URI.

due to unknown contentLength various http(s) implementation will use a chuncked transfer encoding mode
you must take care you http target server supports that (ngnix don't !).
So in case of http(s) transport layer avoid using this. Will be remove in 3.0
Copy from a local input stream to remote.